A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

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"Enough is enough," United Voices chair Peter Cross said in a statement.

An online petition calling for action from Prime Minister Tony Abbott had gained more than 2000 supporters on Tuesday.

But the federal government has yet to warm to a federal inquiry, saying it is up to the states to police such matters.

Instead, it will closely study the outcome of the state inquiry to judge what lessons could be learned and applied at the national level.

Assistant Social Services Minister Mitch Fifield said the states retained responsibility for disability services - including complaints and law enforcement - until the full roll-out of the National Disability Insurance Scheme by 2019.

"It is important to be serious and sober when looking to respond to these matters," Senator Fifield told parliament.

Australian Greens have accused the government of hiding behind the National Disability Insurance Scheme (NDIS) in refusing to budge on a wider inquiry.

Disability spokeswoman Rachel Siewert will on Wednesday call on the Senate to support a national inquiry - but has threatened to refer the matter to a Senate inquiry failing that.

"The government knows (abuse) is happening and they need to take national responsibility," Senator Siewert said.